package hello;

import java.util.Scanner;

public class Practice1 {
	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		System.out.println("请输入一个数");
		int n=in.nextInt();;
		for(int i=1;i<=n;i++){
			for(int j=1;j<=2*i-1;j++){
				System.out.print((char)('A'+i-1));
			}
			System.out.println();
		}
	in.close();}
}
